Method for producing a semi-finished spectacle lens and semi-finished spectacle lens

ABSTRACT

A method for producing a semi-finished spectacle lens and a semi-finished spectacle lens includes identifying the semi-finished spectacle lens by applying a removable sticker having a unique code to the semi-finished spectacle lens. The semi-finished spectacle lens has an embossed code that is engraved into the semi-finished spectacle lens. The sticker is applied to at least partially cover the embossed code. The sticker can be applied directly onto the semi-finished spectacle lens early in the manufacturing process, for example immediately after molding or injection molding. The sticker can also be applied to the semi-finished spectacle lens before further surface treatment is carried out.

CROSS REFERENCE TO RELATED APPLICATIONS

This application is a continuation application of international patentapplication PCT/EP2019/053692, filed Feb. 14, 2019, designating theUnited States and claiming priority from European patent application 18156 641.5, filed Feb. 14, 2018, and the entire content of bothapplications is incorporated herein by reference.

TECHNICAL FIELD

The present disclosure relates to a method for producing a semi-finishedspectacle lens, in particular for identifying and tracking asemi-finished spectacle lens in manufacturing. The disclosurefurthermore relates to the use of a sticker for identifying asemi-finished spectacle lens in manufacturing, to a semi-finishedspectacle lens and to an apparatus for processing a semi-finishedspectacle lens.

BACKGROUND

WO 2013/092987 A1 discloses a method for storing information on aspectacle lens or semi-finished spectacle lens, wherein a marking isproduced permanently on or in the glass or plastic body forming thespectacle lens or semi-finished spectacle lens. The marking is producedby a marking system permanently on or in the glass or plastic body at adefinition point of a local body-specific glass or plastic bodycoordinate system defined by two points on or in the glass or plasticbody. In said local glass or plastic body coordinate system, themanufacturer specifies the location of the lens horizontal and/or of thedistance and/or near and/or prism reference point. A reference is thusprovided after the surface processing.

EP 2 541 490 A1 is concerned with the authentication of lenses andfurther discloses a lens processing management system, in which anauthentication section for lenses is provided in order to prevent anunauthorized use of a lens design. US 2013/0075465 A1 discloses a methodin which firstly an activation code is detected and subsequent steps arecarried out only after a permissible activation code has been detected.Unauthorized production can thus be prevented.

The document US 2012/0314186 A1 describes a method for edge processingof a spectacle lens. The manufacturer produces a unedged spectacle lensand provides it with a memory marking. The information stored in thememory marking is read out by the optician and the edge processing ofthe spectacle lens is performed on the basis of the stored information.

Various methods for the mass production of spectacle lenses,semi-finished spectacle lenses or so-called pucks, semi-finishedproducts or blanks are known. Two customary production methods arecasting and injection molding.

In “casting,” the thermosetting plastic allyl diglycol carbonate (e.g.,CR39) is usually used in spectacle optics. The monomer is typicallypresent in the form of a liquid of low viscosity. In order to obtain aspatially crosslinked solid, a peroxide catalyst is supplied. Thecasting formulation is then introduced into a tool mold or casting moldhaving e.g., two (glass) mold shells. An elastic spacer ring is situatedbetween said mold shells. The polymerization takes place for example inthe refrigerator/heating cabinet or in the water bath at temperatures ofbetween 50 and 100° C. Since the temperature is intended to be increasedvery slowly and uniformly, the duration of the polymerization processcan be as much as several hours to days depending on the thickness andgeometry of the casting. The outstanding mechanical loading capacity ofthis plastic allows the casting not only of finished products but alsoof semi-finished products, for example with a first surface (e.g., frontsurface) already shaped, the second surface (prescription surface; e.g.,back surface) of which can be manufactured as desired by milling,grinding and polishing.

“Injection molding” is an efficient method for producing plasticspectacle lenses or semi-finished spectacle lenses in large numbers. Incontrast to casting, the plastic (polymer) is already present ingranulated form in the case of injection molding. Exemplary plasticmaterials are thermoplastics such as PMMA (polymethylmethacrylate), PC(polycarbonate), and PS (polystyrene). The granules are melted in theinjection cylinder, converted into a homogeneous melt, and injected intothe corresponding tool mold at high pressure. After a short coolingphase, the spectacle lenses molded in this way have attained asufficient dimensional stability and can be removed from the tool mold.

In both cases, by means of the tool mold—besides the desired shape—acode or an identification can be embossed into the semi-finishedspectacle lens. During casting/molding, therefore, a code embossed inthe tool mold is transferred or molded onto each semi-finished spectaclelens produced by said tool mold. A unique identification of anindividual semi-finished spectacle lens is not possible, rather only asubsequent assignment of tool and semi-finished spectacle lens.Alternatively, a code can be embossed into the semi-finished spectaclelens by means of laser engraving.

SUMMARY

In view of the related art, one object of the present disclosure mayconsist in providing an improved method for producing, in particular foridentifying, a spectacle lens or semi-finished spectacle lens. Inparticular, it would be desirable to enable an identification ofsemi-finished spectacle lenses with a small space requirement inconjunction with typically good readability of the identification.Furthermore, it would be desirable to enable an individualization at theearliest possible point in time in the manufacturing process.

A first aspect of the disclosure therefore proposes providing a methodfor producing a semi-finished spectacle lens, characterized by the stepof identifying the semi-finished spectacle lens by applying a(detachable) sticker on the semi-finished spectacle lens, wherein thesticker has a code for unique identification of the semi-finishedspectacle lens. The semi-finished spectacle lens has a second codeembossed into the semi-finished spectacle lens, wherein the sticker isapplied on the semi-finished spectacle lens in such a way that thesticker at least partly covers the second code embossed into thesemi-finished spectacle lens.

The inventors have recognized that in the case of the methods foridentifying in manufacturing as used in the prior art, the problem stillexists that a not insignificant part of the lens surface is taken up bythe code. This holds true particularly if a large number of parameterssuch as, for example, the geometric properties of the tool mold and thusof the semi-finished spectacle lens are intended to be coded.Furthermore, conventionally codes cannot be removed in a straightforwardway since the codes are embossed into the lens material and thusnecessitate a mechanical surface aftertreatment, even if no materialremoval would be necessary for producing the final shape of thespectacle lens at the position of the code.

A semi-finished spectacle lens additionally undergoes one or moremanufacturing steps to yield the finished spectacle lens. Contrary tothe conventional approach with a code being embossed directly into thespectacle lens material in order to be able to undergo furthermanufacturing steps, the inventors have recognized that instead,surprisingly, a sticker can be applied to the semi-finished spectaclelens during manufacturing. Surprisingly, such an identification isalready possible at an early point in time in manufacturing, inparticular directly after release from the tool mold for injectionmolding or casting. The sticker has a code for unique identification ofthe semi-finished spectacle lens. Consequently, the surface is notdamaged. After the sticker has been removed, the corresponding regioncan manifest its desired optical and cosmetic effect.

By virtue of the sticker having a code for unique identification of thesemi-finished spectacle lens, not only is a subsequent assignment oftool and semi-finished spectacle lens possible, but an individual lenselement can be tracked. By way of example, if a multiplicity ofsemi-finished spectacle lenses are produced and, after approximatelyhalf of the elements to be processed, a problem occurs or amanufacturing parameter “drifts away” then in the case of conventionalidentification by means of a code embossed in the tool mold, for safetyor in order to satisfy the desired high quality requirement, it wasnecessary to segregate the entire batch and not use it any further. Byvirtue of the semi-finished spectacle lenses being individuallyidentified, however, it is possible to ascertain the point when aproblem occurred, with the result that unaffected elements can continueto be used. Furthermore, in the case of parameters drifting away,targeted countermeasures can be taken by virtue of the fact that anindividual correction value for affected elements can be taken intoaccount in subsequent manufacturing steps. In particular, the uniqueidentification of a semi-finished spectacle lens by means of a stickermakes it possible to use so-called big data analyses in the massproduction of spectacle lenses. An identification at an early point intime in manufacturing furthermore enables a linking with a manufacturingtime in the form of a time stamp or a virtual time stamp, for example,which can be linked with the unique code.

A second aspect of the present disclosure proposes a semi-finishedspectacle lens with a (detachable) sticker, wherein the sticker has acode for unique identification of the semi-finished spectacle lens. Thesemi-finished spectacle lens has a second code embossed into thesemi-finished spectacle lens, wherein the sticker is applied on thesemi-finished spectacle lens in such a way that the sticker at leastpartly covers the second code embossed into the semi-finished spectaclelens.

A third aspect of the present disclosure proposes the use of a(detachable) sticker for identifying a semi-finished spectacle lensand/or for tracking a semi-finished spectacle lens in manufacturing,wherein the use typically comprises applying the sticker on thesemi-finished spectacle lens, and wherein the sticker has a code forunique identification of the semi-finished spectacle lens. Thesemi-finished spectacle lens has a second code embossed into thesemi-finished spectacle lens, wherein the sticker is applied on thesemi-finished spectacle lens in such a way that the sticker at leastpartly covers the second code embossed into the semi-finished spectaclelens.

A fourth aspect of the present disclosure proposes an apparatus forprocessing a semi-finished spectacle lens comprising a receptacle for asemi-finished spectacle lens; and an apparatus for applying a(detachable) sticker to the semi-finished spectacle lens, wherein thesticker has a code for unique identification of the semi-finishedspectacle lens. Typically, the apparatus furthermore comprises a readingdevice for reading the code and a data interface, wherein the apparatusis configured to register the code in a database.

A further aspect of the present disclosure proposes a method forprocessing a semi-finished spectacle lens, wherein the method comprisesthe following steps:

providing a semi-finished spectacle lens;

applying a sticker to the semi-finished spectacle lens, wherein thesticker typically has a code for unique identification of thesemi-finished spectacle lens;

reading out the code in a downstream manufacturing step; and

processing the semi-finished spectacle lens on the basis of the read-outcode of the sticker.

A further aspect of the present disclosure proposes a method forproducing, in particular for identifying, a semi-finished spectaclelens, wherein the method comprises the following steps:

providing a semi-finished spectacle lens;

reading out a code from at least one tool mold that was used to mold atleast one surface of the semi-finished spectacle lens;

applying a sticker to the semi-finished spectacle lens, wherein thesticker typically has a code for unique identification of thesemi-finished spectacle lens;

assigning the code of the tool mold and the code of the sticker. It goeswithout saying that these steps can advantageously be combined with thesteps of the method in accordance with the first aspect.

In other words, it is thus possible to produce a connection between theunique code of the sticker and the code of the tool mold. Typically, afirst code of a first tool mold, e.g., for molding a front surface ofthe semi-finished spectacle lens, and/or a second code of a second toolmold, e.g., for molding a back surface of the semi-finished spectaclelens, are/is read out and the assignment to the code of the sticker isproduced. Consequently, in subsequent manufacturing steps it is nolonger necessary to read out one or two separate codes. Instead, thecode of the sticker can be read out and, thanks to the assignment to thecodes of the tool mold(s), information about one or more surfaces of thesemi-finished spectacle lens can be obtained.

A further aspect of the present disclosure provides a method forproducing a semi-finished spectacle lens comprising the following step:Identifying the semi-finished spectacle lens by applying a (detachable)sticker on the semi-finished spectacle lens, wherein the sticker has acode for unique identification of the semi-finished spectacle lens; andwherein the sticker is used as a reference for at least one controlregion or a coordinate system of the semi-finished spectacle lens, inparticular a reference for a coordinate system with four quartiles,wherein the semi-finished spectacle lens has a second code embossed intothe semi-finished spectacle lens, and wherein the method furthermorecomprises the following steps:

reading out the code of the sticker from a first side of thesemi-finished spectacle lens; and

reading out the embossed second code from a second side of thesemi-finished spectacle lens.

A further aspect of the present disclosure provides a method forproducing a semi-finished spectacle lens comprising the following step:identifying the semi-finished spectacle lens by applying a (detachable)sticker on the semi-finished spectacle lens, wherein the sticker has acode for unique identification of the semi-finished spectacle lens; andwherein the sticker is used as a reference for at least one controlregion or a coordinate system of the semi-finished spectacle lens, inparticular a reference for a coordinate system with four quartiles;wherein the sticker is applied on the semi-finished spectacle lens witha positioning accuracy from a group of ±1 mm, ±500 μm, ±200 μm, ±100 μm,±50 μm, ±20 μm, ±1° and ±0.5° angular accuracy relative to a center ofthe semi-finished spectacle lens.

One advantage of this configuration may be that surfaces to be processedcan be oriented or determined in a simpler manner during themanufacturing method. The sticker can flexibly be applied on a surfaceof the semi-finished spectacle lens that has not yet been processed tocompletion, or else on a surface of the semi-finished spectacle lensthat has already been processed to completion, and serves as a referencethere. The sticker can form a reference without the possibly alreadyfinished surface being damaged. Optionally, a marking embossed into thesemi-finished spectacle lens can be at least partly covered by thesticker. The sticker can be used as a new identification or as a newreference for identifying control regions or as a new reference for acoordinate system, for example with quartiles such as e.g., Q1, Q2, Q3,Q4. An improved accuracy of subsequent manufacturing steps can beachieved as a result.

A further advantage may be that more expedient manufacturing equipmentcan be used. A sticker as a reference or with a coordinate system may beeasier to read out than a reference embossed into the semi-finishedspectacle lens. The sticker can replace or supplement a referenceembossed into the semi-finished spectacle lens. The sticker can bepositioned on the semi-finished spectacle lens in such a way that it canserve as a reference for subsequent manufacturing steps. In particular,the sticker can be applied on the semi-finished spectacle lens with apositioning accuracy from a group of ±1 mm, ±500 μm, ±200 μm, ±100 μm,±50 μm, ±20 μm. The sticker can be applied on the semi-finishedspectacle lens with a positioning accuracy from a group of ±2°, ±1° and±0.5° angular accuracy relative to a center of the semi-finishedspectacle lens. The center of the semi-finished spectacle lens canrelate to a center of the back surface of the semi-finished spectaclelens. As a result, the sticker as such can be used as a reference forsubsequent manufacturing steps. This results in a synergistic effectthat goes beyond pure data communication of data stored in a code.Alternatively or additionally, the code of the sticker can be a datamatrix code. The data matrix code can form the reference for thecoordinate system of the semi-finished spectacle lens. As a result, thesticker as such can be used as a reference for subsequent manufacturingsteps. This results in a synergistic effect that goes beyond pure datacommunication of data stored in a code.

Unless specified otherwise, the terms used herein should be understoodwithin the meaning of the DIN EN ISO 13666:2013-10 standard from theDeutsches Institut für Normung e.V. [German Institute forStandardization].

Pursuant to section 5.8 of the DIN EN ISO 13666:2012 standard, the termfront surface or object-side surface denotes that surface of a spectaclelens intended to face away from the eye in the spectacles. Pursuant tosection 5.9 of the DIN EN ISO 13666:2013-10 standard, the term backsurface or eye-side surface denotes that surface of a spectacle lensintended to face the eye in the spectacles. The terms front surface(front side) and back surface (back side) are used here, mutatismutandis, for a semi-finished spectacle lens.

In the context of the present disclosure, the term semi-finishedspectacle lens may denote a spectacle lens or a precursor of a spectaclelens which still has to undergo at least one manufacturing step.Exemplary manufacturing steps are processing of at least one surface,fitting by grinding for a frame (edging), coating, tinting, etc., butnot the mounting of the finished spectacle lens into the frame of a pairof spectacles. A semi-finished spectacle lens may relate in particularto a lens blank, blank, spectacle lens blank or spectacle lenssemi-phase product pursuant to at least one of sections 8.4.1 and 8.4.2of the DIN EN ISO 13666:2013-10 standard, that is to say in particularto a lens blank or blank having only one optical surface processed tocompletion. A semi-finished spectacle lens may furthermore relate to aspectacle lens before edge processing, in particular an unedgedspectacle lens pursuant to section 8.4.7 of the DIN EN ISO 13666:2013-10standard.

A sticker is typically equipped with a self-adhesive surface on oneside, said surface being configured for adhesive fixing on lensmaterial. The sticker can be chemically resistant. An adhesive bond oran adhesive of the sticker is typically designed such that it isresistant to mechanical influences.

In one configuration, provision can be made for the method to compriseapplying the sticker on a front or back side of the semi-finishedspectacle lens. In particular, the sticker can also be applied within aused region for a final spectacle lens shape. Mechanical embossing intoa surface of the semi-finished spectacle lens is not necessary.

Typically, the sticker can be a detachable sticker. In the context ofthe present disclosure, a detachable sticker can also be understood tobe a destructively removable sticker. One advantage of thisconfiguration is that a surface covered by the sticker can be uncoveredagain. The surface can thus be employed once again for some other use.By way of example, the surface can be uncovered after a parameter for asubsequent manufacturing step has been read out. Alternatively, thesticker can also be applied on a surface of the semi-finished spectaclelens which is at least part of a used region or a final spectacle lensshape.

Optionally, the method can comprise the following steps:

producing the semi-finished spectacle lens by casting or injectionmolding; applying the sticker on the semi-finished spectacle lens afterthe casting or injection molding. Optionally, alternatively oradditionally, the method can comprise the following steps:—surfaceprocessing of a front and/or back surface of the semi-finished spectaclelens; wherein the step, in particular for a first step, of applying thesticker on the semi-finished spectacle lens is carried out before thestep of surface processing of the front and/or back surface of thesemi-finished spectacle lens. In particular, the sticker can be applieddirectly after casting or injection molding e.g., after release from theshell. The inventors have discovered that the identification with asticker can withstand subsequent processing steps in lens manufacturing,such that despite the use of a sticker, an identification can beeffected at a very early point in time even before further processingsteps for surface processing.

Optionally, the method comprises the following step:—tracking theindividual semi-finished spectacle lens in manufacturing by way of amulti-stage manufacturing process on the basis of the sticker with thecode for unique identification of the semi-finished spectacle lens (1),said sticker having been applied on the unique identification of thesemi-finished spectacle lens. Optionally, alternatively or additionally,the method can comprise the following steps: reading out the code forunique identification of the semi-finished spectacle lens; interrogatingat least one correction parameter (for a subsequent processing step) onthe basis of the code; and applying the correction parameter in thesubsequent processing step. In particular, a correction parameter for asubsequent processing step can be interrogated and applied. Oneadvantage of this configuration may consist in a better yield duringmanufacturing. Correction parameters can be obtained for example byanalyzing earlier spectacle lenses or semi-finished spectacle lenses. Byway of example, the correction parameter can counteract possible trendsor drifting of manufacturing parameters.

Furthermore, an actual refractive power, also referred to as true power,can be established slightly differently for example for each castingwith respect to basic curve, position in the batch polymerization,without the process drifting away. Furthermore, an actual refractiveindex, also referred to as true index, can differ slightly fromsemi-finished product to semi-finished product. One or both values canbe interrogated and then later influence the prescription surfacecalculation as a variable and thus enable more accurate Rx spectaclelenses. In this case, particularly in the case of manufacturingparameter drift, methods of so-called big data analysis can typically beused. A manufacturing parameter or correction parameter can beinterrogated for example from a database of a process control. In otherwords, the sticker code does not necessarily directly contain parametersor data, but rather only a unique (optionally partly encrypted) number.The associated information and data are present for example in adatabase, referred to for example as LODB or “Lens Order Data Base,” andcan be interrogated or retrieved and be taken into account in aprocessing step that follows directly or later.

Optionally, the semi-finished spectacle lens can have a second codeembossed into the semi-finished spectacle lens. The sticker can beapplied to the semi-finished spectacle lens in such a way that thesticker at least partly covers the second code. One advantage of thissolution consists in a small area requirement. A further advantage isthat less area is thus covered, which facilitates a cosmetic test of theopposite front surface.

In particular, the sticker can completely cover the second code. By wayof example, a molded tool code can be adhesively covered congruently bythe casting or injection molding. By way of example, the sticker can bepositioned with an accuracy of at least one from ±2° rotation and ±0.5mm position on the second code. One advantage of this solution is thatthe code which needs to be taken into account for unique identificationis clear for the subsequent manufacturing steps. Therefore, a readerdoes not have to differentiate between the code of the sticker and thecovered second code. In particular, no incorrect code is read in. Anerror rate can thus be reduced.

Typically, the semi-finished spectacle lens can thus have a second codeembossed into the semi-finished spectacle lens, wherein the method inaccordance with the first aspect can furthermore be characterized inthat the sticker is applied on the semi-finished spectacle lens in sucha way that the sticker at least partly covers the second code embossedinto the semi-finished spectacle lens. The second code can also beapplied on the semi-finished spectacle lens in such a way that thesticker completely covers the second code embossed into thesemi-finished spectacle lens.

In particular, the semi-finished spectacle lens can furthermore have athird code embossed into the semi-finished spectacle lens, and whereinthe sticker is applied to the semi-finished spectacle lens in such a waythat the sticker at least partly leaves free the third code embossedinto the semi-finished spectacle lens. By way of example, the third codecan be a human-readable code, such as an alphanumeric code, for example.One advantage of this configuration is that the third code thus stillremains accessible and can enable for example a rapid identification ofa basic shape such as e.g., a front surface curvature or a materiale.g., comprising a UV absorber.

Optionally, the semi-finished spectacle lens can have a second codeembossed into the semi-finished spectacle lens, wherein the methodfurthermore comprises the following steps: reading out the code of thesticker from a first side of the semi-finished spectacle lens andreading out the embossed second code from a second side of thesemi-finished spectacle lens. In particular, the second code can beembossed on the first side of the semi-finished spectacle lens; whereinthe sticker is applied on the same side of the semi-finished spectaclelens as the second code; and wherein the sticker typically at leastpartly covers or overlaps the second code. One advantage of thissolution consists in a small area requirement, the respective codenevertheless being able to be read out. Since the spectacle lensmaterial is transparent, the embossed code, even though it is situatedon the same side as the sticker, can be read out from the other sidethrough the spectacle lens.

Typically, the sticker can consist of a material which is recyclabletogether with lens material of the semi-finished spectacle lens.Alternatively or additionally, the sticker can consist of a materialwhich can be cut or removed together with the lens material. The stickercan typically be a machinable sticker. One advantage of this solution isthat the sticker does not have to be removed separately before thesurface processing. A subsequent separation of lens material and stickermaterial can also be obviated. In particular, the sticker can thus servefor a temporary identification during manufacturing.

The sticker is typically vacuum-stable. In other words, the sticker isembodied in such a way that it does not outgas in a vacuum. Vacuum canbe defined here as a pressure of ≤100 mbar. By way of example, thesticker is embodied in such a way that it loses not more than 2,typically not more than 1, typically not more than 0.5, typically notmore than 0.1, percent by mass or percent by volume in a vacuum. Oneadvantage of this configuration is that the sticker can remain on thesemi-finished spectacle lens during further processing steps. The lenscan thus be processed further together with the sticker. It should benoted here that in the case of conventional stickers outgassing issometimes a technically desired process, e.g., during the curing ofadhesive bonds. By way of example, the sticker can comprise an adhesivecomprising an acrylate compound. A vacuum-stable silicone adhesive canalternatively be used. The inventors have recognized that one advantageof this solution may be that an optical surface is not contaminated evenduring high-vacuum processes. Typically, no adhesive based on siliconecompounds is used.

Typically, the sticker has a thermal stability of at least one from morethan 100° C., more than 115° C., more than 130° C. or more than 140° C.One advantage of this configuration is that the sticker can remain onthe semi-finished spectacle lens during further processing steps of thesemi-finished spectacle lens, for example during so-called curing orhardening. The lens can thus be processed further together with thesticker.

Typically, the sticker is resistant vis-á vis one or more subsequentprocessing steps in lens manufacturing such as, for example, in relationto low pressure or high pressure cleaning, for example using water (orso-called surface scrubbing). In particular, the sticker is embodied insuch a way that it withstands high pressure cleaning at one from morethan 80 bar, more than 100 bar, more than 120 bar or more than 150 bar.Typically, the sticker is resistant to cleaning agents, and/or hydroxidesolutions, and/or (distilled) water and/or KOH. Typically, the stickeris UV-resistant. Typically, the sticker is embodied in such a way thatthe adhesion persists during vacuum processes. Typically, the stickerexhibits transport stability, in particular thermal stability, e.g.,vis-à vis temperatures of between −20° C. and +60° C., and/or moistureresistance in particular vis-à vis fluctuations in air humidity.Typically, once the sticker has been applied to the semi-finishedspectacle lens, said sticker has a storage life of at least 6 months,typically of at least 12 months. Typically, the sticker is embodied insuch a way that it adheres on a rough surface, in particular a surfaceprocessed by laser engraving. Typically, the sticker has alow-reflection surface. One advantage of this configuration is betterreadability.

Typically, the sticker can be embodied in semitransparent fashion. Oneadvantage of this configuration is that a visual inspection is stillpossible. Particularly with the use of large-area stickers, a check forpossible underlying defects can thus still take place.

In one configuration of the method, the sticker can form a reference forat least one control region or a coordinate system of the semi-finishedspectacle lens, in particular a reference for a coordinate system withfour quartiles. By way of example, a conventionally engraved or embossedreference point or code can be replaced or supplemented by the sticker.A cast or injection-molded tool code e.g., of a mold shell is usuallysituated in a predetermined location. By way of example, during castingthe mold shells with code are used such that the code is in the verticalon a filling funnel. Consequently, the position when sticking thesticker over is clear and can be obtained as a new reference by thesticker. In particular, the sticker can be applied on a surface of thesemi-finished spectacle lens that has already been processed tocompletion, and forms a reference there without the finished surfacebeing damaged. By way of example, a cast or injection-molded tool code,e.g., of a mold shell, is always situated in a specific location. By wayof example, during casting the mold shells with code are used such thatthe code is in the vertical on a filling funnel. Consequently, theposition when sticking the sticker over is clear.

Typically, the sticker can have information regarding the locationand/or type of defects in the semi-finished spectacle lens. By way ofexample, it is possible to store coordinates of bubbles that ariseduring casting/molding in the semi-finished spectacle lens or lensblank.

Typically, the sticker has a code with at least one manufacturingparameter for a downstream processing step. One advantage of thisembodiment is that such information can be transferred to a downstreammanufacturing step directly, for example by means of a code contained onthe semi-finished spectacle lens. In this regard, by way of example, amanufacturing machine can be set by means of the sticker. Optionally,the manufacturing parameter on the sticker can be coordinated with amanufacturing parameter planned for this semi-finished spectacle lensand plausibilation or error correction can thus be effected. In thisregard, by way of example, an incorrectly sorted element can berecognized. Manufacturing parameters can be understood to meaninformation regarding process parameters, properties of a surface to beproduced, etc. The sticker or the code of the sticker can have amanufacturing parameter directly, i.e. encoded in the code, orindirectly, wherein one or more associated manufacturing parameters canbe retrieved from a database by means of the code for uniqueidentification.

Optionally, the sticker can have at least one feature for authenticitychecking and/or a color coding. By way of example, a hologram, logo,watermark or some other feature for authenticity checking can beprovided. The feature for authenticity checking can be a code which canbe part of a hologram. One advantage of this solution is that theauthenticity or origin of the semi-finished spectacle lens can beverified. One advantage of a color coding consists in a simple visualidentification, for example directly by a user. Optionally, the colorcoding can represent further information, e.g., different UVtransmissions of the substrate material. Consequently, the same moldshells can be used for different material properties and the productdifferentiation is effected by way of the color coding.

Optionally, the apparatus in accordance with the fourth aspect can beconfigured to read out a second code embossed into the semi-finishedspectacle lens; to determine a curvature of the semi-finished spectaclelens on the basis of the embossed second code; and to apply thedetachable sticker to the semi-finished spectacle lens taking account ofthe curvature of the semi-finished spectacle lens. Semi-finishedspectacle lenses usually have curved surfaces. This can result increasing when a sticker is applied. By virtue of the fact that on thebasis of the embossed second code, which typically has information aboutthe curvature of the semi-finished spectacle lens or at least enablesuch information to be interrogated, the curvature of the semi-finishedspectacle lens can be determined, there is no need for complicatedmeasurement of the curvature before the sticker is applied.Consequentially, the sticker can be applied in a simple manner takingaccount of the curvature, as a result of which creasing can be avoidedor at least reduced.

The advantages described in detail above for the first aspect of thedisclosure apply accordingly to the further aspects of the disclosure.

It goes without saying that the aforementioned features and those yet tobe explained below can be used not only in the combination specified ineach case but also in other combinations or on their own, withoutdeparting from the scope of the present disclosure.

BRIEF DESCRIPTION OF THE DRAWINGS

The disclosure will now be described with reference to the drawingswherein:

FIG. 1 shows elements for the casting of a semi-finished spectacle lens;

FIG. 2 shows the process of applying a sticker on a semi-finishedspectacle lens;

FIG. 3 shows a flow diagram of method steps in the context of casting;

FIG. 4 shows a flow diagram of method steps in the context of injectionmolding;

FIG. 5 shows a schematic illustration of an apparatus for applying asticker to a semi-finished spectacle lens;

FIG. 6 shows a flow diagram from the mass production of semi-finishedspectacle lenses to delivery to the user;

FIG. 7 shows an illustration of an exemplary semi-finished spectaclelens with a sticker;

FIG. 8 shows a second illustration of a semi-finished spectacle lenswith a sticker;

FIG. 9 shows a semi-finished spectacle lens with defects;

FIG. 10 shows a further illustration of a semi-finished spectacle lenswith a sticker;

FIG. 11 shows a further illustration of a semi-finished spectacle lenswith a sticker;

FIG. 12A shows an illustration of a semi-finished spectacle lens with aconventional embossed code;

FIG. 12B shows an illustrations of a semi-finished spectacle lens with asticker having a unique code and an embossed code in the semi-finishedspectacle lens from the side showing the sticker;

FIG. 12C shows an illustration of the semi-finished spectacle lens ofFIG. 12B viewed from the other side;

FIG. 13A shows an illustration of a semi-finished spectacle lens with asticker having a code, a second code embossed into the semi-finishedspectacle lens and a further alphanumeric code;

FIG. 13B shows an illustration of the semi-finished spectacle lens ofFIG. 13A viewed from the other side of the semi-finished spectacle lens;and

FIG. 14 shows a flow diagram of a method of identifying a semi-finishedspectacle lens.

DESCRIPTION OF EXEMPLARY EMBODIMENTS

FIG. 1 shows a tool mold for so-called casting that is known from therelated art. The tool mold comprises a central element 21 having anattachment 22 and also a front-side tool mold or mold shell 23 and aback-side tool mold or mold shell 24. During casting, the thermosettingplastic allyl diglycol carbonate is usually used in spectacle optics,this being known by the tradename CR39, for example. The latter can alsobe introduced into the element 21 through the attachment 22, saidelement being closed off by the tool mold 23 on the front side and bythe tool mold 24 on the back side. A semi-finished spectacle lens 1 isthus produced.

Besides the desired surface shape, the front- and/or back-side tool mold23, 24 can have a code 25, 26, which is correspondingly embossed intothe semi-finished spectacle lens. During casting/molding, therefore, acode embossed in the tool mold is transferred or molded onto eachsemi-finished spectacle lens 1 produced by said tool mold 23, 24. Aunique identification of an individual semi-finished spectacle lens 1 isnot possible, rather only a subsequent assignment of tool andsemi-finished spectacle lens.

By contrast, FIG. 2 shows the identification of a semi-finishedspectacle lens 1 in accordance with the present disclosure, wherein a(detachable) sticker 10 is applied to the semi-finished spectacle lens1. Typically, the sticker 1 can have a code 11 for unique identificationof the semi-finished spectacle lens 1. In the present exemplaryembodiment, the sticker 10 is applied on a back surface of thesemi-finished spectacle lens 1 after the back-side tool mold 24 hasreleased the back-side surface of the semi-finished spectacle lens 1.This is illustrated schematically by the arrow.

Typically, the sticker can thus be applied on the semi-finishedspectacle lens at a point in time as early as possible, if not even theearliest possible point in time. The sticker can be applied inparticular before a first step of the surface processing of the frontand/or back surface of the semi-finished spectacle lens. Individualsemi-finished spectacle lenses can thus be tracked from the beginning ofmanufacturing.

The code 11 can typically be a machine-readable code such as a QR codeor DMC code, for example. Alternatively or additionally, an alphanumericcode can be provided. Alternatively or additionally, a color coding canbe provided. One advantage of this configuration is a fast visualidentification.

Optionally, the sticker 10 and/or code 11 can have a size of at leastone from at least 1 mm², at least 4 mm², at least 9 mm², at least 16mm², at least 25 mm², at least 36 mm², at least 64 mm², at least 100mm², at least 144 mm², at least 196 mm², at least 256 mm², at least 324mm², and at least 400 mm². One advantage of a detachable sticker may bethat it can be larger than a permanently embossed code. Thus thereadability (by machines and by human beings) can be improved and a riskof read-out errors can be reduced.

The mass production of spectacle lenses usually takes place in amulti-stage manufacturing process. By way of example, firstlysemi-finished spectacle lenses are produced in large numbers. Insubsequent processing steps, said semi-finished spectacle lenses can beadapted to the exact optical power required for a user, can be coated,and can subsequently be adapted to a desired frame shape for the user.

The production of the semi-finished spectacle lenses is not necessarilycarried out at the same location as a subsequent user-specificadaptation, for example. By virtue of the fact that a sticker having acode for unique identification of the semi-finished spectacle lens isalready applied to the semi-finished spectacle lens at an early stage ofmanufacturing, an individual lens element can be continuously identifiedand tracked over typically the entire manufacturing process. Typicallyover the entire manufacturing process from mass production of the blanksthrough customized adaptation to hand over to the customer.

FIGS. 3 and 4 show exemplary sequences for producing a semi-finishedspectacle lens including applying a sticker on the semi-finishedspectacle lens by casting (FIG. 3) and injection molding (FIG. 4).

In accordance with FIG. 3, in a first step 101, the semi-finishedspectacle lens 1 can be produced by casting. For example using anapparatus as already shown in FIG. 1. In a second step 102, firstly theelement 21 is removed and subsequently, in step 103, the front-side toolmold 23 and the back-side tool mold 24 are opened. In an optional nextstep 104, a visual inspection of the semi-finished spectacle lens 1 canbe carried out.

In the next step 105, the semi-finished spectacle lens 1 is identifiedby a sticker 10 being applied on the semi-finished spectacle lens 1,wherein the sticker 1 has a code 11 for unique identification of thesemi-finished spectacle lens 1. Optionally, a further sticker 12 can beprovided, which has for example a feature for authenticity checkingand/or a color coding, for example a hologram. However, such elementscan also be part of the sticker 10.

As shown in step 106, the code of the sticker 10 can be registered in adatabase 30. The uniquely identified semi-finished spectacle lens 1 isthus registered. Typically, in step 107, a code 25 of the front-sidemold tool 23 and/or a second code 26 of the back-side mold tool 24are/is additionally registered. This can likewise be carried out in thedatabase 30. By virtue of the code for unique identification of thesemi-finished spectacle lens typically being registered together withone or more codes of the mold tool, a unique assignment can be effected.Consequently, it is no longer necessary to read out the respectiveindividual codes possibly embossed into the semi-finished spectaclelens, rather it is possible to carry out an evaluation of the uniquecode 11. It goes without saying that, in this procedure, an assignmentof the tool molds used during manufacturing, like radii of curvature ofthe front and/or back side of the semi-finished spectacle lens 1, forexample, to the code 11 for unique identification of the semi-finishedspectacle lens can also be effected in a different way. Optionally, itis also not necessary for the corresponding code to be embossed into asurface of the semi-finished spectacle lens by hardware by means of thetool elements. A usable region of the semi-finished spectacle lens canthus be enlarged, which can be advantageous particularly in the case oflarge lens elements.

FIG. 4 shows a modification of the method from FIG. 3, wherein thesemi-finished spectacle lens 1 is produced by injection molding. Thebasic sequence of injection molding has already been described in theintroduction.

In step 111, a plastic material is melted in an injection cylinder orextruder 29′ and is injected at high pressure into a tool mold 29 forproducing a semi-finished spectacle lens 1. In step 112, thesemi-finished spectacle lens is removed and optionally coated. In theoptionally following step 114, a visual inspection can be carried out.This can optionally be a camera-based visual inspection involving thedetermination of a position of defects such as air inclusions, forexample. A usable region can subsequently be defined on the basis ofknowledge of said defects. By way of example, it is possible to choose ashape for a finished spectacle lens on the semi-finished spectacle lensin such a way that the latter is not affected by the defects. Rejectscan thus be reduced. Optionally, such information can be contained in orlinked with the code of the semi-finished spectacle lens.

The subsequent steps 115 and 116 can correspond to steps 105 and 106already described above. In step 117, analogously to step 107, aconnection or link between the unique code of the sticker 11 and thetool mold 29 can be produced. This is also referred to as a so-calledmatching.

In an optional step 118, the lens material can be cured, for example bybeing exposed to UV radiation or undergoing a thermal treatment.Typically, the sticker has a thermal stability of at least 100° C., inparticular more than 115° C., in particular more than 130° C.

Optionally, in step 119, the semi-finished spectacle lens can besubjected to one or more postprocessing processes. Exemplarypost-processes are (i) curing, for example after the injection molding,at 130° C.-140° C. and optionally for a duration of more than 2 hours,in particular more than 5 hours; (ii) surface cleaning, such as cleaningat low or high water pressure; (iii) wet-chemical cleaning and/oractivation using a rinsing agent or distilled water; (iv) surfacecoating, the sticker typically being thermally stable and resistant tocaustic substances such as, for example, KOH or UV curing; (v)antireflection coating, typically on that side of the semi-finishedspectacle lens on which the sticker is not attached, wherein for thispurpose the sticker is typically embodied in vacuum-resistant fashionand, in particular, does not outgas. Typically, the sticker exhibitstransport stability, in particular resistance to environmentalinfluences such as temperature of between −20° C. and +60° C., moistureresistance and friction resistance. The sticker can have a storage lifeof typically not less than 6 months, in particular not less than 12months. The sticker can consist of a material which is recyclabletogether with lens material and/or can be removed together with the lensmaterial.

By virtue of the semi-finished spectacle lens being identified by thesticker for unique identification of the semi-finished spectacle lens,early processing steps can already be individualized. By way of example,a so-called “single piece flow” typically a user-specific job, canalready be started in mass production. Thus steps of mass productionsuch as curing, etc. can also already be configured user-specifically.Consequently, an individualization can typically already be effected inthe early manufacturing steps, which hitherto have not beenuser-specific. By way of example, a so-called post-curing process canalready be individualized depending on the desired end product.Typically, an interposed storage process (DC) can be dispensed with.

FIG. 5 shows an apparatus 50 for processing a semi-finished spectaclelens 1. It goes without saying that not all of the processing steps haveto be carried out by this one apparatus, rather further apparatuses canbe provided. The apparatus 50 comprises a receptacle 51 for asemi-finished spectacle lens 1 and also an apparatus 52 for applying asticker 10 to the semi-finished spectacle lens 1, the sticker 10typically has a code 11 for unique identification of the semi-finishedspectacle lens 1.

Optionally, the apparatus 50 can furthermore comprise a reading device53 for reading the code 11 and a data interface 54, wherein theapparatus 50 is configured to register or store the code in a database30. In the present example, a plurality of stickers are provided on aroll 55, from which they are then applied by means of the apparatus 52for applying the sticker to the semi-finished spectacle lens 1.

The assignment of one or more tool molds 23, 24, 29 for producing thesemi-finished spectacle lens, said assignment already having beendescribed above with reference to steps 107 in FIG. 3 and 117 in FIG. 4,can optionally likewise be effected in the apparatus 50 or alternativelybe a downstream or upstream step.

Optionally, the apparatus (50) can be configured to read out a secondcode (25, 26) embossed into the semi-finished spectacle lens; todetermine a curvature of the semi-finished spectacle lens (1) on thebasis of the embossed second code (25, 26); and to apply the detachablesticker (10) to the semi-finished spectacle lens taking account of thecurvature of the semi-finished spectacle lens. For this purpose, theapparatus (52) can be mounted in an angularly adjustable manner and alocation of the apparatus (52) relative to the semi-finished spectaclelens can be set on the basis of the curvature of the semi-finishedspectacle lens, such that the sticker (10) is applied to thesemi-finished spectacle lens taking account of the curvature of thesemi-finished spectacle lens. In particular, creasing can thus beavoided.

FIG. 6 shows various method steps 61, 62, 63, 64 for producing aspectacle lens. The tool molds or molds 23, 24 can be provided in anupstream step 60. The front-side and/or back-side tool mold 23, 24 canhave a code 25, 26. In a first step 61, the mass production ofsemi-finished spectacle lenses can be carried out using such tool molds.In this case, the front- and/or back-side code 25, 26 of the tool moldscan be embossed into the semi-finished spectacle lens. Typically, thecodes 25, 26 are registered in a database 30.

As early as during mass production 61, in accordance with the presentdisclosure, stickers 10 with a code 11 for unique identification can beapplied to the semi-finished spectacle lenses. The codes can beregistered in a database 30. In particular, a code 11 of a sticker 10can be linked with the code(s) 25, 26 of the associated tool mold(s) byway of the database 30. It can therefore be sufficient to read out onlythe code 11 of the sticker 10, instead of both a front-side code 25 of afront-side tool mold 23 and a back-side code 26 of a back-side tool mold24. The semi-finished spectacle lenses 1 can subsequently be subjectedto further processing steps. A linking 66 between the individualsemi-finished spectacle lenses 1 from mass production 61 and thepossibly already user-specific processing 62 and individualization 63can be effected thanks to the individual code.

Optionally, a, typically unique, code 13 can be applied to thesemi-finished spectacle lens 1 or, depending on the process step, to thefinished spectacle lens. This can be done in the context of thecustomized processing 62, as shown in FIG. 6. The code 13 can once againbe registered in a database 30 and be linked with at least one of thecodes 11, 25, 26. Optionally, the code 13 can correspond to the code 11.One advantage of this configuration is that a unique assignment isachieved in a simple manner. By way of example, the code 11 can becopied within a machine and can be applied to the spectacle lens orsemi-finished spectacle lens, e.g., by means of laser engraving. Noteven a database link is required in this case. By way of example, thatsurface on which the sticker 10 with the code 11 is applied is processedduring the processing 62. Machining is carried out, for example, whereinthe sticker is concomitantly removed or destructively removed togetherwith spectacle lens material. Thanks to the code 13, a uniqueidentification is still possible even after the sticker has beenremoved. In the preceding manufacturing steps, the sticker 10 with thecode 11 typically offers simpler readability (by machines) than anengraved or embossed code 25, 26, 13.

Typically, the sticker 10 can have a code with at least onemanufacturing parameter for a downstream processing step. By way ofexample, a coating to be applied or at least one parameter of a surfaceto be manufactured can be encoded. Alternatively or additionally, thesticker has a code (for unique identification of the semi-finishedspectacle lens) on the basis of which at least one manufacturingparameter can be interrogated from a database. Optionally, the codeitself contains no parameters at all, or the parameters being in adatabase. The customized adaptation 63 is followed by handover to thecustomer for use by the latter in step 64. In this case, once again alinking 66 can be effected and the customer can optionally be presentedwith a documentation card 65 regarding the spectacle lens adapted in acustomized manner for said customer. Optionally, a linking with thedatabase 30 can again be effected in this case.

FIG. 7 shows an illustration of a further exemplary embodiment of asemi-finished spectacle lens 1 with a sticker 10, wherein the stickerhas a code 11 for unique identification of the semi-finished spectaclelens. The sticker can be a detachable sticker or a destructivelyremovable sticker. A detachable sticker can relate to a sticker whichcan be removed again, typically without residues, from the semi-finishedspectacle lens 1. Typically, the sticker can be applied once again tothe semi-finished spectacle lens, for example after interim surfaceprocessing. A destructively removable sticker can relate to a stickerwhich can indeed be removed, but is destroyed in the process. This canbe advantageous particularly if the sticker is used for authenticitychecking, since the sticker then cannot be reused.

Typically, the sticker 10 consists of a material which is recyclabletogether with the lens material from which the semi-finished spectaclelens 1 is produced. By way of example, in this case, a surfaceprocessing of that surface on which the sticker 10 is applied can becarried out without the sticker having to be removed beforehand.

Optionally, the sticker can be embodied in semitransparent fashion.Consequently, a visual inspection of the semi-finished spectacle lens 1is still possible. Optionally, the semi-finished spectacle lens can alsohave a conventionally embossed second code 25, as shown in FIG. 7. Byway of example, this can be a directly readable alphanumeric code or amachine-readable code. A machine-readable two-dimensional DMC code isprovided in the present example.

FIG. 8 shows an illustration of a further embodiment of a semi-finishedspectacle lens 1 with a sticker 10. In this case, the machine-readablecode 26 is embodied in the form of a barcode with an additionalalphanumeric element, which is reproduced in a mirror-inverting mannerin this case since it lies on the front side. A further field 26′ forfurther codes can optionally be provided. In the present example, afeature for authenticity checking in the form of a hologram 12 isadditionally provided.

FIG. 9 shows an illustration of a semi-finished spectacle lens 1 withdefects 72, 73, 74. An attachment 71 can be discerned at the top side ofthe semi-finished spectacle lens 1, which attachment was used tointroduce the spectacle lens material. The formation of bubbles 72 canoccur in this region. These are defects that render this region unusablefor a final spectacle lens shape. An exemplary final spectacle lensshape is designated by reference sign 80 in FIG. 9. There ought to be nodefects within the final spectacle lens shape 80.

In the present case, the semi-finished spectacle lens 1 has even furtherdefects 73 and 74 besides the bubbles 72. However, since said defectslie outside the region of the final spectacle lens 80, they are notrelevant. Typically, the semi-finished spectacle lens 1 has a sticker 10containing information about a potentially usable region 80 for a finalspectacle lens and/or information about the location of defects 72, 73,74. A usable region can thus be determined on the basis of the locationof the defects. If only a small usable region is required for a smallfinal spectacle lens, for example, such a semi-finished spectacle lens 1can continue to be used for production despite the defects 72, 73, 74,with the result that rejects can be reduced. It goes without saying thatthe corresponding information about defects can also be stored in adatabase, which can be linked by means of a unique code on the sticker10.

Optionally, the sticker 10 can also contain information about theproduction process, for example in the case of production problemsregarding a tool, inclusions, polymerization, process parameters,ambient parameters, or information about the optical properties such asthe refractive power of the front and/or back surface. It goes withoutsaying that such information can alternatively or additionally also beretrieved from a database, for example the LODB, by way of the code ofthe sticker.

FIG. 10 shows an illustration of a further embodiment. In this case, asticker 10 is once again applied on the semi-finished spectacle lens 1.In the present case, the sticker can be used for identification or as areference for identifying control regions or as a reference for acoordinate system, here with quartiles (Q1, Q2, Q3, Q4). Alternativelyor additionally, the marker 10 can also be used as a reference point. Byway of example, the sticker can specify a horizontal center and/or avertical location, here with an offset d with respect to the horizontal.An additional sticker 12 or a further region 12 of the sticker 10 canoptionally be provided. On this it is possible to store furtherinformation and/or to provide a feature for authenticity checking suchas a hologram. Further codes can optionally be applied in the lowerregion 26′.

FIG. 11 shows a further illustration of a semi-finished spectacle lens 1with a sticker 10, similar to the embodiment shown in FIG. 10. In thisexample, a system of coordinates or zero point 82 can be determined in adefined manner on the basis of a lower region of the code and ahorizontal center. The filling neck or attachment 71 that was used tointroduce the spectacle lens material can furthermore be discerned. Thefilling direction is indicated by arrow 84.

FIGS. 12A to 12C show an advantageous arrangement of a combination of afirst code on a sticker 10 and an embossed second code 26. Aconventional code 26 embossed into the semi-finished spectacle lens canbe provided on one side of the semi-finished spectacle lens 1. This is alaser-engraved code in the present example. By way of example, this canbe a code which is assigned to a back-side tool mold (see FIG. 1) and isthus embossed on a back side. Alternatively or additionally, furtherinformation such as, for example, a curvature, a product designation orthe like can be provided, which can be used in the subsequent productionmethod.

A sticker 10 can be applied on this code, as shown in FIG. 12B. Thissticker can have a code for unique identification of the semi-finishedspectacle lens. Typically, the sticker 10 is attached on thesemi-finished spectacle lens in such a way that it at least partlyoverlaps or, as in the present example, completely covers the secondcode 26. One advantage of this configuration is that no additional spaceis required on the lens element.

Since the semi-finished spectacle lens 1 is transparent, both theengraved second code 26 and the code on the sticker 10 can neverthelessbe read out. By way of example, the code on the sticker 10 can be readout from the back side, whereas the engraved code 26—in amirror-inverting manner—can be read out through the semi-finishedspectacle lens from the front side, as illustrated in FIG. 12C.

The associated method wherein the semi-finished spectacle lens has asecond code 26 embossed into the semi-finished spectacle lens cancomprise the following steps: reading out the code of the sticker 10from a first side of the semi-finished spectacle lens 1; and reading outthe embossed second code 26 from a second side of the semi-finishedspectacle lens 1. Typically, the second code 26 can be embossed on thefirst side of the semi-finished spectacle lens and the sticker 10 can beapplied on the same side of the semi-finished spectacle lens as thesecond code, wherein the sticker at least partly overlaps the secondcode.

FIGS. 13A and 13B show illustrations of a semi-finished spectacle lens 1with a sticker 10 having a code 11, a second code 26 embossed into thesemi-finished spectacle lens, and at least one further optional thirdcode, such as alphanumeric codes 27 and 28, for example. In this case,FIG. 13A shows a view from the back side (here: concave side) of thesemi-finished spectacle lens. FIG. 13B shows a view from the front side.The alphanumeric codes 27, 28 are consequentially reproduced in amirror-inverting manner.

As already described in FIGS. 12A-12C, the sticker 10 can at leastpartly, typically completely, cover the embossed second code. Thesticker 10 can be attached on the same surface as or on a differentsurface (front or back side) than the embossed second code. If sticker10 and code 26 are provided on different surfaces, it is possible todetermine covering in a direction parallel to the optical axis accordingto DIN EN ISO 1366-2013-10. In this example, the sticker 10, as shown inFIG. 13A, is attached on the back side. The code 11 of the sticker isthus readable from the back side. From the front side, as shown in FIG.13B, the embossed second code 26 can still be seen in front of theadhesive surface of the sticker. In other words, a superimposed doublecode is used.

Optionally, the sticker has one or more third codes, typicallyalphanumeric codes 27, 28. Such codes can typically be read by anemployee in particular without interrogating a database. The sticker(10) can be applied to the semi-finished spectacle lens (1) in such away that the sticker (10) partly or completely covers the second code(25, 26) embossed into the semi-finished spectacle lens and at leastpartly, typically completely, leaves free the third code (27, 28)embossed into the semi-finished spectacle lens. By way of example, thecode 27 specifies a base curve or base curvature “199” and the code 28“UPMR8-380” specifies the semi-finished spectacle lens as a “UniversalPuck” of the type “MR8” with a UV identifier “UV 380”.

FIG. 14 shows a flow diagram of an exemplary method in accordance withone embodiment of the present disclosure. In step 201, a semi-finishedspectacle lens 201 is produced or provided. In step 202, a sticker isapplied on the semi-finished spectacle lens, wherein the sticker has acode for unique identification of the semi-finished spectacle lens.Optionally, steps 201 and 202 can be carried out at a different locationthan subsequent processing of the semi-finished spectacle lens. By wayof example, in step 203, the semi-finished spectacle lens with theapplied sticker can be transported to a destination.

In step 204, the code of the sticker can be read out. On the basisthereof, in step 205, a customized adaptation can be effected, such as,for example, surface processing, coating or adaptation, in particular ofthe surface on which the sticker is not applied, to a desired opticalcorrection power of the customer. In principle, all parameters and dataor at least a portion thereof can be stored in a database (e.g., theLODB), and not encrypted directly in the code. The unique code can beused as a link to the database for any desired manufacturing step.

In step 206, the sticker can optionally be removed. Alternatively, untilhandover to the customer, the sticker can remain on the semi-finishedspectacle lens or, after adaptation to the customer's frame, can evenstill remain on the finished spectacle lens, in order thus to enable acomplete documentation of the entire manufacturing process from theproduction of the semi-finished spectacle lens (e.g., in the form of alens blank) to handover of the finished spectacles to the customer.

The present disclosure furthermore relates to the following clauses.

Clause 1. A method for producing a semi-finished spectacle lens (1),characterized by the step of identifying the semi-finished spectaclelens (1) by applying a detachable sticker (10) on the semi-finishedspectacle lens (1), wherein the sticker (10) has a code (11) for uniqueidentification of the semi-finished spectacle lens (1).

Clause 2. The method according to clause 1, characterized by thefollowing steps of:

producing the semi-finished spectacle lens (1) by casting or injectionmolding; and

applying the sticker (10) after the casting or injection molding on thesemi-finished spectacle lens (1);

surface processing of a front and/or back surface of the semi-finishedspectacle lens (1);

wherein the step of applying the sticker on the semi-finished spectaclelens is carried out before the step of surface processing of the frontand/or back surface of the semi-finished spectacle lens.

Clause 3. The method according to either of the preceding clauses,characterized by the following steps: reading out the code (11) forunique identification of the semi-finished spectacle lens (1);interrogating at least one manufacturing parameter on the basis of thecode (11); and applying the manufacturing parameter in a subsequentprocessing step.

Clause 4. The method according to any of the preceding clauses,characterized in that the semi-finished spectacle lens (1) furthermorehas a second code (25, 26) embossed into the semi-finished spectaclelens, and wherein the sticker (10) is applied on the semi-finishedspectacle lens (1) in such a way that the sticker (10) at least partlycovers the second code (25, 26) embossed into the semi-finishedspectacle lens.

Clause 5. The method according to clause 4, characterized in that thesemi-finished spectacle lens furthermore has a third code (27, 28)embossed into the semi-finished spectacle lens, and wherein the sticker(10) is applied to the semi-finished spectacle lens (1) in such a waythat the sticker (10) at least partly leaves free the third code (27,28) embossed into the semi-finished spectacle lens.

Clause 6. The method according to any of the preceding clauses,characterized in that the semi-finished spectacle lens (1) has a second(25, 26) embossed into the semi-finished spectacle lens, and wherein themethod furthermore comprises the following steps:

reading out the code (11) of the sticker (10) from a first side of thesemi-finished spectacle lens (1); and

reading out the embossed second code (25, 26) from a second side of thesemi-finished spectacle lens (1).

Clause 7. A semi-finished spectacle lens (1) with a detachable sticker(10), wherein the sticker (10) has a code (11) for unique identificationof the semi-finished spectacle lens (1).

Clause 8. The semi-finished spectacle lens (1) according to any of thepreceding clauses, characterized in that the sticker (10) consists of amaterial which is recyclable together with lens material of thesemi-finished spectacle lens (1).

Clause 9. The semi-finished spectacle lens (1) according to any of thepreceding clauses, characterized in that the sticker (10) has a thermalstability of at least one from more than 100° C., more than 115° C., ormore than 130° C.

Clause 10. The semi-finished spectacle lens (1) according to any of thepreceding clauses, characterized in that the sticker (10) forms areference for at least one control region of the semi-finished spectaclelens or a coordinate system of the semi-finished spectacle lens, inparticular a reference for a coordinate system with four quartiles.

Clause 11. The semi-finished spectacle lens (1) according to any of thepreceding clauses, characterized in that the sticker (10) has at leastone from a feature (12) for checking authenticity or a color coding.

Clause 12. The semi-finished spectacle lens (1) according to any of thepreceding clauses, characterized in that the semi-finished spectaclelens (1) furthermore has a second code (25, 26) embossed into thesemi-finished spectacle lens, and wherein the sticker (10) is applied onthe semi-finished spectacle lens in such a way that the sticker (10) atleast partly covers the second code (25, 26).

Clause 13. The use of a detachable sticker (10) for identifying asemi-finished spectacle lens (1) in manufacturing, wherein the sticker(10) has a code (11) for unique identification of the semi-finishedspectacle lens (1).

Clause 14. An apparatus (50) for processing a semi-finished spectaclelens (1) comprising

a receptacle (51) for a semi-finished spectacle lens;

an apparatus (52) for applying a detachable sticker (10) to thesemi-finished spectacle lens, wherein the sticker has a code (11) forunique identification of the semi-finished spectacle lens;

a reading device (53) for reading the code; and

a data interface (54), wherein the apparatus is configured to registerthe code (11) in a database (30).

Clause 15. The apparatus according to clause 14, characterized in thatthe apparatus (50) is configured to read out a second code (25, 26)embossed into the semi-finished spectacle lens; to determine a curvatureof the semi-finished spectacle lens (1) on the basis of the embossedsecond code (25, 26); and to apply the detachable sticker (10) to thesemi-finished spectacle lens taking account of the curvature of thesemi-finished spectacle lens.

The foregoing description of the exemplary embodiments of the disclosureillustrates and describes the present invention. Additionally, thedisclosure shows and describes only the exemplary embodiments but, asmentioned above, it is to be understood that the disclosure is capableof use in various other combinations, modifications, and environmentsand is capable of changes or modifications within the scope of theconcept as expressed herein, commensurate with the above teachingsand/or the skill or knowledge of the relevant art.

The term “comprising” (and its grammatical variations) as used herein isused in the inclusive sense of “having” or “including” and not in theexclusive sense of “consisting only of.” The terms “a” and “the” as usedherein are understood to encompass the plural as well as the singular.

All publications, patents and patent applications cited in thisspecification are herein incorporated by reference, and for any and allpurposes, as if each individual publication, patent or patentapplication were specifically and individually indicated to beincorporated by reference. In the case of inconsistencies, the presentdisclosure will prevail.

The invention claimed is:
 1. A method for processing a semi-finishedspectacle lens comprising: providing a semi-finished spectacle lenshaving an embossed code on one of an object side surface or an eye-sidesurface of the semi-finished spectacle lens; applying a detachablesticker having a unique code to the surface of the semi-finishedspectacle lens having the embossed code to at least partly cover theembossed code; uniquely identifying the semi-finished spectacle lens bythe unique code, wherein the unique code is a machine-readable code;performing at least one manufacturing step on the semi-finishedspectacle lens while having the detachable sticker attached to thesemi-finished spectacle lens; and removing the detachable sticker fromthe spectacle lens after performing one or more manufacturing steps onthe spectacle lens.
 2. The method as claimed in claim 1, wherein thesticker is a reference for at least one of a reference region or acoordinate system of the semi-finished spectacle lens, the methodfurther comprising: reading out the unique code of the sticker from afirst side of the semi-finished spectacle lens; and reading out theembossed code from a second side of the semi-finished spectacle lens. 3.A method for processing a semi-finished spectacle lens comprising:providing a semi-finished spectacle lens having an embossed code on asurface; applying a sticker having a unique code to the surface of thesemi-finished spectacle lens having the embossed code to at least partlycover the embossed code; uniquely identifying the semi-finishedspectacle lens by the unique code, wherein the unique code is amachine-readable code; producing the semi-finished spectacle lens bycasting or injection molding; applying the sticker onto thesemi-finished spectacle lens after the casting or the injection molding;surface processing at least one of a front surface or a back surface ofthe semi-finished spectacle lens after the sticker has been applied;reading out the unique code of the sticker from a first side of thesemi-finished spectacle lens; and reading out the embossed code from asecond side of the semi-finished spectacle lens.
 4. The method asclaimed in claim 1, further comprising: surface processing at least oneof a front surface or a back surface of the semi-finished spectaclelens; and applying the sticker to the semi-finished spectacle lensbefore carrying out the surface processing of the at least one of thefront surface or the back surface of the semi-finished spectacle lens.5. A method for processing a semi-finished spectacle lens comprising:providing a semi-finished spectacle lens having an embossed code;applying a sticker having a unique code to the semi-finished spectaclelens to at least partly cover the embossed code; uniquely identifyingthe semi-finished spectacle lens by the unique code; reading out a codefrom at least one tool mold that was used to mold at least one surfaceof the semi-finished spectacle lens; applying the sticker with theunique code for unique identification of the semi-finished spectaclelens to the semi-finished spectacle lens having the at least one surfacemolded in the at least one tool mold; and assigning a connection betweenthe code of the tool mold and the unique code of the sticker.
 6. Amethod for processing a semi-finished spectacle lens comprising:providing a semi-finished spectacle lens having an embossed code;applying a sticker having a unique code to the semi-finished spectaclelens to at least partly cover the embossed code; uniquely identifyingthe semi-finished spectacle lens by the unique code; and tracking arespective semi-finished spectacle lens being manufactured in amulti-stage manufacturing process on a basis of the sticker with theunique code for unique identification of the respective semi-finishedspectacle lens, the sticker having been applied on the respectivesemi-finished spectacle lens.
 7. A method for processing a semi-finishedspectacle lens comprising: providing a semi-finished spectacle lenshaving an embossed code; applying a sticker having a unique code to thesemi-finished spectacle lens to at least partly cover the embossed code;uniquely identifying the semi-finished spectacle lens by the uniquecode; reading out the unique code for unique identification of thesemi-finished spectacle lens; interrogating at least one correctionparameter for a subsequent processing step on a basis of the uniquecode; and applying the correction parameter in the subsequent processingstep.
 8. The method as claimed in claim 1, further comprising: providingthe semi-finished spectacle lens with an additional embossed code, andapplying the sticker to the semi-finished spectacle lens such that thesticker at least partly leaves free the additional embossed code.
 9. Themethod as claimed in claim 1, further comprising: reading out the uniquecode of the sticker from a first side of the semi-finished spectaclelens; and reading out the embossed code from a second side of thesemi-finished spectacle lens.
 10. A method for processing asemi-finished spectacle lens comprising: providing a semi-finishedspectacle lens having an embossed code; applying a sticker having aunique code to the semi-finished spectacle lens to at least partly coverthe embossed code; and uniquely identifying the semi-finished spectaclelens by the unique code, wherein the sticker is applied on thesemi-finished spectacle lens with a positioning accuracy from the groupof ±1 mm, ±500 μm, ±200 μm, ±100 μm, ±50 μm, and ±20 μm relative to acenter of the semi-finished spectacle lens, and an angular accuracy fromthe group of ±1° and ±0.5° relative to a center of the semi-finishedspectacle lens.
 11. A method of identifying a semi-finished spectaclelens in manufacturing, the method comprising: providing a semi-finishedspectacle lens having an embossed code on one of an object side surfaceor an eye-side surface of the semi-finished spectacle lens; providing adetachable sticker having a unique code for a unique identification ofthe semi-finished spectacle lens to one of the object side surface orthe eye-side surface of the semi-finished spectacle lens; applying thedetachable sticker on the semi-finished spectacle lens such that thedetachable sticker at least partly covers the embossed code; performingat least one manufacturing step on the semi-finished spectacle lenswhile having the detachable sticker attached to the semi-finishedspectacle lens; and removing the detachable sticker from the spectaclelens after performing one or more manufacturing steps on the spectaclelens.